To properly answer the OP:
There are plenty of games that specialize as racism simulators, particularly in the MMO Genre. Some examples of these are:
Lotro - Where you can roleplay an Elf phobic Dwarf, or a dwarf phobic elf.
WoW - Where you can roleplay a gnomophobe.
Guild Wars - While you can only play Humans in this game, you can play the ever popular racist human that screams racial insults in the all chat channel everywhere you go, or you can sit back and enjoy some human phobic / bookah bashing Asurans.